Which powder to start with

I got a STW built a couple months ago and have shot 3 boxes of Nosler factory ammo through for the brass. I would like to start reloading for it and would like to start with 160gr Nosler Accubonds. Any recommendations on which powder to start with to start working up a load ? Any help would be greatly appreciated.

rl22,rl25 for mid weight.... rl33,rl50 for heavies.... retumbo, h1000, and h50bmg if you like to srpinkle a bit of single base around. 7828 will work for mid weight too but the pressures tend to be up a bit by the time to get to good speed.
Ball type slow burners can work well too but some bores (like mine) won't eat them well; it's hit and miss with those in this cal and the temp sensativity makes non stabilized stick powders look good.

Lefty7mmstw, I was lucky enough to find some 180gr Bergers so where should I start to work up my loads with Rl50 and rl33? I've already Burnt through all my h1000 and retumbo trying to figure out my chrony problem (returned that pos)